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` @eine tarts @einer @fitta IMPROVEMENT IN VARIABLE GUT-OFF VALVE GEAR.

WILLIAM WRIGHT. OF NEW YORK.

Letters Patent No. 59,887, dated November 20, 1866.

SPECIFICATION.

TC) ALL VVHOM IT MAY CONCERN: i

Be it known that I, WILLIAM WMGHT, of the city, county, and State oi'New York, have invented a certaln new and useful improvement in VariableValve Gear of steam and otherL engines; and I do hereby declare that thefollowing is a full, clear, and." exact description ofthe same,reference being had to the accompanying drawing, which forms part ofthis specication, and in Whichi Figure 1 represents a verticallongitudinal section of my improved variable valve gear as applied to asingle valve; and i Figure 2, a transverse view of thesame, partly inelevation and partly in section.

Similar letters of reference `indicate corresponding parts in each ofthe figures.

- The object of'my invention is to raise and lower the cut-oil` valvesof steam and other engines by an easy cam action adjustable by hand, atpleasure, or by the governor of the engine, as may be, so as to regulatethe range' or action' of the valves by causing them to close at anydesired pointvin the engine stroke; and my improvement consists in anovel combination of a revolving toothed cam or lifter,eccentric cam orhub, and revolving toothed spindle, which is also provided with spiralgrooves or threads for giving the necessary action by a longitudinallysliding movement of the spindle to the toothed cam or lifter, todetermine the period of closing and range or action of the valve,Without, however, or of necessity, 'altering the point or period atwhich the valve commences to open. l

Prior to more minutely describing my improvement, I would remark that itis not only applicable to puppet but also ,to sliding or other valves,and though here shown as Working only one valve, is or 'may .be used induplicate for operating two or more valves, and, as before observed, mayeither be worked by hand or by the engine governor. l

In the accompanying drawing the portion marked A represents the valveshaft working in a suitable frame or bearing, B, and made to revolve byany appropriate means. This shaft is made hollow, to receive within it alongitudinally sliding spindle, C, that also revolves with the shaft A,but which may be turned in opposite directions independently of it bymeans of spiral ribs or threads, a, cut on or in the spindle, and madeto it into or gear with a correspondingly threaded nut, D, fast to thevalve shaft. This spindle, C, is also provided or made with along coggedor toothed portion, for operating the cam or revolving lifter E, whichregulates the rise of the valve by its action on or under a toe-piece,e, of a sliding yoke, F, that carries the valve stem d. Fast to thevalve shaft is an eccentric or cam projection, G, receiving WithinV orthrough it the toothed portion., E, of the spind-le C, and the outerperiphery or surface of which is eccentric to the spindle C and valvesha-ft A. Fast also to the valve shaft is a part-hub, H, the innersurface of which may serve as a seat or bearing in part to the toothedcam or revolving lifter E, While the outer surface or periphery of thesame may be made concentric to the valve shaft, and serve, eitherseparately or in conjunction with a portion or portions of the peripheryof the lifter E, to receive upon it in a state of -rest the toe-piece,c, of the yoke F, so as to relievethe valve of undue pressure, or thevalve may be otherwise relieved when closed. The lifter E lies withinthe partliub H, and in the course of adjustment turns, as it were,within the same. Internally it is made to fit so as to lturn upon theeccentric G, and is provided with teeth, d, which gear with the toothedportion, Z1, of the spindle y C. Externally the lifter is formed with atoe, e, which, as the valve shaft, longitudinally sliding spindle, andlifter, all revolve together, gives more or less lift to the valveaccordingly as said toe is projected more or less out of the part-hubIl, and, of course, by the action of the eccentric Gr, more or lessdistant from the centre of the valve shaft, such action beingregulatedby sliding in or out the internal spindle C, which, by means ofi'ts spiral grooves or threads acting in the nut D of the valve shaft,gives an independent turn in either direction by the toothed portion, b,of the spindle to the lifter. In this way, Without, however, or ofnecessity, changing the period at which the valve commences to lift, isthe range or actionof it and period for closing the same determined.

What I claim as my invention, and desire to secure by Letters Patent,is- The combination of the revolving toothed lifter E, eccentric G fastto the valve shaft, and toothed and spirally grooved, or ribbed,longitudinally sliding spindle C, arranged for operation together, andwith the hollow valve shaft, substantially as shown and described.

W. WRIGHT. t Witnesses:

A. LE CLERC, J. W. Goonies.

